单项选择题

在一定业务量范围内，固定不变的成本是()。

A、总变动成本
B、单位变动成本
C、总成本
D、单位成本
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单项选择题
I had rather you______with her than I did, for you two had a closer relationship.
A.talk
B.talked
C.had talked
D.talking
单项选择题
Phillip placed too much ____ on sports and not enough on his work.
A、interest
B、concern
C、hobby
D、emphasis
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